guard duty

noun
a military assignment involving watching over or protecting a person or place or supervising prisoners.

Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
guard duty

noun
the duty of serving as a sentry; "he was on guard that night" 
WordNet® 3.0, © 2006 by Princeton University.
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00:10
Guard duty is always a great word to know.
So is quincunx. Does it mean:
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Example sentences
Being detailed on guard duty today, it was my lot to stand solitary and alone at my post when the old year died.
Rigid guard duty was established at once, and everyone was impressed with the necessity for vigilance and watchfulness.
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